Gson 抛出 "BEGIN_OBJECT expected but BEGIN_ARRAY found" - 如何使用 TypeToken

Question

第一次尝试 Gson 而不是循环遍历 JSON 对象以提高速度。

这是我解析的输入数据集

{
  "data": [
    {
      "access_token": "XXXXX", 
      "category": "Community", 
      "name": "Startup notes by Vrashabh", 
      "id": "XXXXX", 
      "perms": [
        "ADMINISTER", 
        "EDIT_PROFILE", 
        "CREATE_CONTENT", 
        "MODERATE_CONTENT", 
        "CREATE_ADS", 
        "BASIC_ADMIN"
      ]
    }, 
    {
      "access_token": "XXXX", 
      "category": "Community", 
      "name": "Clean Bangalore", 
      "id": "XXXXX", 
      "perms": [
        "ADMINISTER", 
        "EDIT_PROFILE", 
        "CREATE_CONTENT", 
        "MODERATE_CONTENT", 
        "CREATE_ADS", 
        "BASIC_ADMIN"
      ]
    }, 
    {
      "access_token": "XXXXX", 
      "category": "Internet/software", 
      "name": "Getmeetin", 
      "id": "XXXXX", 
      "perms": [
        "ADMINISTER", 
        "EDIT_PROFILE", 
        "CREATE_CONTENT", 
        "MODERATE_CONTENT", 
        "CREATE_ADS", 
        "BASIC_ADMIN"
      ]
    }
  ], 
  "paging": {
    "cursors": {
      "before": "MTU3MzE3MTA0MjkyMjY4MQ==", 
      "after": "MjcyMTIwMzE2Mjk3NzI5"
    }
  }
}

这是我的 gson 映射 class

public class AccountsResponse {
    ArrayList<AcResponseData> data;
    ArrayList<PagingData> paging;

    public class AcResponseData {
        public String access_token;
        public String category;
        public String name;
        public String id;
        public String[] perms;
    }
    public class PagingData{
        public Cursors cursors;
    }
    public class Cursors{
        public String before;
        public String after;
    }
}

解析数据的代码

AccountsResponse responseAccounts = gsonResponse.fromJson(response.getRawResponse(), AccountsResponse.class);

我知道我不应该期待数据转换方面的魔法，我在 SO 上发现了 other 问题，要求我实现 TypeToken，但我无法让它在这种情况下工作。如何使用 TypeToken 将这些数据导入 ORM 如果需要从 ORM

中删除，我不介意实际上也不读取该分页数据

更新如下更改了 ORM，但现在我得到

java.lang.WhosebugError

Answer 1

问题出在您的 AccountsResponse class 上。它应该是一个对象 PagingData 而不是 ArrayList，因为根据您问题中的 json 响应，"paging" 是一个 JSON 对象而不是 JSON 大批。因此，您应该将 paging 声明为 PagingData 对象而不是 PagingData 对象的 ArrayList。那应该可以解决它。

public class AccountsResponse {
    ArrayList<AcResponseData> data;
    PagingData paging;

    public class AcResponseData {
        public String access_token;
        public String category;
        public String name;
        public String id;
        public String[] perms;
    }
    public class PagingData{
        public Cursors cursors;
    }
    public class Cursors{
        public String before;
        public String after;
    }
}

如果有帮助请告诉我。

Gson 抛出 "BEGIN_OBJECT expected but BEGIN_ARRAY found" - 如何使用 TypeToken

Gson throws "BEGIN_OBJECT expected but BEGIN_ARRAY found" - how to use TypeToken

android

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